642-883 試験問題を無料オンラインアクセス

A network has four routers running IS-IS with the NET addresses below:
R1 - 49.1234.1111.1111.1111.00
R2 - 49.1234.2222.2222.2222.00
R3 - 49.4321.1111.1111.1111.00
R4 - 49.4321.2222.2222.2222.00
How can IS-IS authentication be enabled between all routers?

• A.interface authentication with the command (config-if)#isis passwordword
• B.area authentication with the command (config-if)#isisarea-passwordword
• C.domain authentication with the command(config-rtr)#domain-passwordword
• D.domain authentication with the command (config-if)#isis domain-passwordword

A service provider is about to purchase more IPv4 address space. Which organization can facilitate this purchase?

• A.USANOG
• B.APNIC
• C.IETF
• D.IEEE
• E.NANOG

A customer is concerned about rerouting attacks on the IS-IS domain spanning the company. Which keychain management configuration is valid to authenticate IS-IS link- state information and provide a first response to this type of attack for Cisco IOS XR instances?

• A.key chain cisco-xrkey 10key-string myP@ssw0rd!interface GigabitEthernet 3/1/1ip addressip_address subnet_maskip router isisisis authentication mode md5 level-1isis authentication key-chain cisco-xr level-1
• B.configurekey chain isis-keys!key 8cryptographic- algorithm MD5send-lifetime 18:05:00 may 31 2014 infiniteaccept-lifetime 18:05:00 may 31 2014 infiniterouter isis 1isp-password keychainisis-keys
• C.configurekey chain isis-keyskey 1key-string myP@ssw0rdcryptographic-algorithm MD5send-lifetime 18:05:00 may 31 2014 infiniteaccept-lifetime 18:05:00 may 31 2014 infiniterouter isis 1Isp-password keychain isis-keys
• D.configurekey chain isis-keyskey-string myP@ssw0rdsend-lifetime 18:05:00 may 31 2014 infiniteaccept-lifetime 18:05:00 may 31 2014 infiniterouter isis 1isp-password keychain isis-keys

For which reason might an enterprise's Internet circuits use private AS BGP peerings?

• A.The enterprisewishes to obscure internal routing information from the Internet.
• B.The enterprise uses BGP confederations internally.
• C.The enterprise owns their own IP space.
• D.All redundant circuits are through the same provider.

A network engineer implements IS-IS authentication in a router. When the engineer implements the same password on the router's peer, the output below is displayed with the debug IS-IS authentication information:
* Nov 6 13:23:46:967: ISIS-Authinfo: No auth TLV found in received packet
Which option is one reason for this output?

• A.There is an error with the NET address in one of the routers.
• B.The length of the password is not the same.
• C.The authentication is set the same way, but the password does not match.
• D.Authentication was not configured on the router that sent the update.